I've read several articles about customizing the home screen icon used by IOS (and some Android) phones/tablets for the "add to homescreen" option. I'm seeing different recommendations re: sizes of the pngs, number of pngs, and am not clear where I should upload it/them.

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I figured out that the images needed to be in the directory where the "core" wp folders are, ie. the public_html, or in whatever sub-directory that contains the wp-admin, wp-includes, wp-content, etc. I had been placing them in the theme root and nothing was happening. Moved them to the public_html and they started showing up!

In this case I was following the directions in the second article listed above: Quick Tip: Custom IOS Homescreen icons...